Shock absorber



2 sHEUs-SHEET 1.

w.v T. 'SCHRUM AND E.l KRANTZ. SHOCK ABSORBEH. APPLICATION FILED MAYI`611921.

Patented Aug. 15, 1922.

w. I.. scHRuM AND E. KRANTZ.

sHocK Asoas'fn.

APPEICATION FILYEI)` VMAY I6, 1921.

Patented Aug. 15,1922.

2 SHEETS-SHEET 2.

ran-Z721.

'WILLIAIVL T. SURE/Ulli, QF

rLLrnors, essie-rions, nr nrnncfr eine ransnn nssrennrnnrs, 'ro sCHnUra MANU- FACTURING- CO., OF CHICAGO, 114211310153,

CORPGRATON OF JILLII'JOIS.`

SHOCK f ABSORBER..

Leaders.

Application filed May 16,

c a citizen of the United lStates,residing at Hammond, in the county ot' Lake and State of Indiana, and Eownnnlninvrz, a citi zen of the United States. residing at 7.18 Waveland Avenue, Chicago, lllinois, in the' county or Cook, and State ot lllinois, have` invented a new and useful l'inprovernent in Shock Absorberc, of which the following is a specification. f i

This invention relates to'shock absorbers and more especially to a Ashock absorber adapted to be used in connection with a vehicle s1 ring such yiscoinrnonly used on rnotor vehicles. Y l

1n that form of Vdevice embodying the features of our invention, shown in the accompanying drawingslligure 1 is a view in side elevation of theshock absorber, 2 is a vertical sectional view of the device shown in Fig. 1, Fig. 3 isa view taken as indicated by the line 3 of Fig. 2, Fig. 4 vis a View taken asindicatedby the line 4 of Fig. 2, Fig. 5 is a viewtaken as indicated by the line 5 of Fig.'2,`ll`ig. 6 is a view in per spective of a part of the device and Fig. is a vertical sectional view of a modified form of the device.

As shown in the drawings, 10 indicates in general a semi-elliptical leaf spring which may be of any ordinary type. 11 indicates a tubular axle or axle-housing on the ends of which are niountedthewheels of the vehicle in any well known manner. As shown in the drawings, the axle 11 is supported above the spring; but it is obvious that, without detracting from the spirit of this invention, and with but slight inodications, the axle may be supported below the spring. As shown, the axle 11 is surrounded by a casting 12 lhaving vfour projecting lugs or ears 13, two projecting kout beyond the spring 10. rlhe ears 13 are suitably drilled for bolts 14, two of which depend 'downwardly on each side'of the spring.

The shock absorber is arranged below the spring 10 and eoinprisesa casting 20 having a smoothv slightly concaved upper surface 21 adapted to bear` against the un- `dersurace of the spring 10. The casting 20 is provided with ears or lugs 23 cor-` responding tothe ears 13, suitably drilled peeicatcn of Letters latent.

.Patented Aug. 1.3i. 1922 1.921. Serial No. 469,843.

and adapted to receive the ends of the bolts 14 Which are held in place `by suitable nuts. llt will be noted that by this construction, the spring 1,0 is firmly clamped between the axle and the casting 2O and the parts are held in firm engagement, softhat the axle `11-is suitably supported by the spring 10 from the ends thereof. The lower part cf the casting 2O is cylindricalfin form as indicated vby 25.. The ends 4of thek cylindrical part 25' are bored out orvcored as indicated by 26. Pivotally mounted as at 27, on the ends yof the upper part of the casting 2O vare two rbell cranks 2 8, The horizontal `rarms 29 of the bell cranks 28 extend horizontally substantially parallel to and belowthe'spring 10 and are provided on their outer endswith rollers 30V adapted to bear against the under side ofthe lowest' spring` leaf. Each roller 30 is held in contact with the spring leaf by a cned bynuts 35 to ears or lugs 33 extend ing out side ways from the arrn 29. The vertical arms 4Q of the bell cranks 28 depend downwardly and arev provided with vertical slots 41. 4Fitted in each of the bores 26 is a piston 42 vprovided" with a' piston rod 43 extending outwardly beyond the end of thecylindrical part 25 and projecting through the slot 41 in the arm 40 of the bell crank 28. `Snirrounding the piston rod 43 and lying withinthe bore 26 is a spiral spring 44.- Slidablyfmounted on the piston -rod 43 is a sleeve 47 having its outer end extending out beyond the end of the cylindrical part 25, rounded as indicated by 48 and adapted to bear against the arm 40 of the bell crank 28. The other, or inner end of the sleeve'47 is --provided with a flange 50, forming a piston in the bore 26, adapted to bear against the outer end of the spring 44. One of the sleeves' 47 with its flange 50 is shown in perspectivey in Fig. 6. Each of the bolts 26,v is. also provided with aycap 51 screwed on to the end of the cylindrical' pa1jt25 and provided with a circular-open ingy of sutiicientsize to permitk the sleeve 47 to extend therethrough. Each of the piston rods 43fhas screwed on rits outer end a nut57 with kits inner face rounded as in-. diceted by 5,8, and adapted te beer against Cil ycompress the springs del.

the outer side of the arm 4G of the bell crank 23. il suitable lock nut 59, is provided for each of the nuts 57.

ln the operation of the device, upward movement of the axle ll causes the bending of the spring i0, or relative downward movement of its ends. This relative downward movement of the ends of the spring l causes downward movement of the rollers 30, which causes the arms Zl() of the bell cranks to move toward each other. This movement of the arms 40 toward each other causes inward movement of the sleeves i7 and consequent compression of the springs A by franges 50. Downwardmovement of the axle 11, on the contrary, pulls the arms 29 of the bell cranks 2S upwardly by means of the clips 32, which causes the arms 40 to move away from each other. rlhis movement of the arms l() away from each other, operates against the nuts 57 on the piston rods i3 to move the pistons s2 outwardly and away from earn other and consequently lt willf'be seen that by tnis construction both upward and downward movement of the axle ll and consequent bending of the springflO, operates to compress the springs Lll. The sleeves 47 f may be made any desired lengthand likewise the nuts 57 may be set in any position desired in order to give the desired adjustment.

ln lF ig. 7 is shown a modified form of the device. ln this form of device the casting 2Oa corresponds to and is similar to the casting in the preferred form. Instead of having a cylindrical part 25, however, it is provided with two cylinders in which are mounted the pistons 42a in a similar manner to the pistons 42 in the preferred form. The cylinders 25L instead of being made integral with the casting 2OL as in the preferred form, are separately formed and pivoted to the casting as indicated by 100. rlfhe pivots 100 permit slight rocking movement of the cylinders 25, Instead of using one spring ineach of the cylinders, as in the preferred form, the `modified form has mounted in each of the cylinders 25, two concentrically arranged springs, the outer being indicated by ill and the inner by 4151K The piston 42 is madel somewhat smaller than the piston Ll2, so that it will engage only the end of the inner spring 45a and will move inside of the spring del without compressing the same. The flange L on the sleeve 47, corresponding to the flange 50 in the preferred form, is made large enough, however, to engage the ends of bothr springs. Except forfthe modifications noted, the operation of the modified form is substantially the saine as the operation of the preferred form. lt' will be noted, however, that the inward movement ofthe flanges 50ad will compress both springs, while outward movement of the pistons lf2 will compress only the inner springs. By this construction there will be more spring resistance to upward movement of the axle ll than to its downward movement.

lllhile we have shown and described certain embodiments of our invention, it is to be understood that it is capable of many modifications. Changes therefore in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended Claims, in which it is our intention'to claim all novelty inherent in our invention as broadly as possible in view of the prior art.

What we claim:

il. in combination with a leaf spring, a shock absorber comprising a spring support at the center of the spring, a bell crank pivotally mounted on the spring support with the end ofone of its arms bearing against the leaf spring to one side of the center and resilient meansV for cushioning movement of the other arm of said bell crank.

ln combination with a leaf spring, a shock absorber comprising a spring support at the center of the spring, a bell crank pivotally mounted on the spring support with 'the end of one of its arms bearing against the convex surface'of the leaf spring to one side of the center and resilient means for cushioning movement ofthe other arm of said bell crank.

ln combination with a leaf spring, a shock absorber comprising a spring support having a bell crank` pivotally mounted thereon, the end of one arm of said bell crank bearing against the leaf spring and resilientmeans for cushioning movement of the other arm. said resilient means comprising a spiral spring ar 1anged in a bore in the spring support.

4i. ln combination with a leaf spring, a shock absorber comprising a spring support having a bell crank pivotally mounted thereon, the end of one arm of said bell crank bearing against the convex surface of the leaf spring and resilient means for cushioning movement of the other arm, said resilient means comprising a spiral spring arranged in a bore in the spring support.

5. ln combination with a leaf spring, a shock absorber comprising a spring support at the center of the spring, a bell crank pivotally mounted ou the Yspring support with the end of one of its arms bearing against the'leaf spring to one side ofthe center and resilient means for cushioning movement. of the other arm of said bell crank, said resilient means comprising a spiral spring arranged in a bore in the spring support.

6.ln combination with a leaf spring, a

shock absorber' comprising a spring support at the center of the spring, a bell crank plv-- otally mounted on the spring support With the end of one of its arms bearing against the convex surface of the leaf spring to one side of the center and resilient means for cushioning movement of. the other arm of said bell crank, said resilient means comprising a spiral spring arranged in a bore in the spring support.

.7. In combination with a leaf spring, a shock absorber comprising a spring support having a bell crank pivotally mounted thereon, the end of one arm of said bell crank being in sliding engagement with the convex surface of the leaf spring and resilient means for cushioning movement of the other arm.

8. In combination with a semi-elliptical leaf spring, a shook absorber comprising a spring support having a bell crank pivotally mounted thereons the end of one arm of said bell crank being in sliding engagement with the convex surface of the semi-elliptical leaf spring and resilient means forl cushioning movementof the other arm. y n

9. ln a devicev of the character described,

vzal

a spring support, a leaf spring-rigidly 'l mounted on the-spring support, and apbell crank pivotally mounted on the spring sup port, the. end of one arm of said bell crank bearing lagainst the leafspring and resilient means for cushioning movement of the other arm. ,K

10. In a device of the character described,

a spring support, a leaf spring rigidly' mounted on the spring support, and a bell crank pivotally mounted on the spring support, the end of one arm of said bell crank bearing vagainst the convex` surface of the leaf spring and resilient means forcushioning movement of the yother arm.

In Witness whereof Wehave hereunto sety 

